<template>
  <div class="cart">
    <h4>全部商品</h4>
    <div class="cart-main">
      <div class="cart-th">
        <div class="cart-th1">全部</div>
        <div class="cart-th2">商品</div>
        <div class="cart-th3">单价（元）</div>
        <div class="cart-th4">数量</div>
        <div class="cart-th5">小计（元）</div>
        <div class="cart-th6">操作</div>
      </div>
      <div class="cart-body">
        <ul class="cart-list"
        v-for="(cart) in cartInfoList" 
        :key="cart.id">
          <li class="cart-list-con1">
            <input 
            type="checkbox" 
            name="chk_list"
            :checked="cart.isChecked "
            @change="updateChecked(cart,$event)">
          </li>
          <li class="cart-list-con2">
            <img :src="cart.imgUrl">
            <div class="item-msg">{{ cart.skuName }}</div>
          </li>
         
          <li class="cart-list-con4">
            <span class="price">{{ cart.skuPrice }}.00</span>
          </li>
          <li class="cart-list-con5">
            <a href="javascript:void(0)" class="mins" @click="handler('minus',-1,cart)">-</a>
            <input autocomplete="off" type="text" :value="cart.skuNum" 
            @change="handler('change',$event.target.value * 1,cart)"
            minnum="1" class="itxt">
            <a href="javascript:void(0)" class="plus"
            @click="handler('add',1,cart)">+</a>
          </li>
          <li class="cart-list-con6">
            <span class="sum">{{ cart.skuNum * cart.skuPrice }}</span>
          </li>
          <li class="cart-list-con7">
            <a  class="sindelet" @click="deleteCartById(cart)">删除</a>
            <br>
            <a href="#none">移到收藏</a>
          </li>
        </ul>
      </div>
    </div>
    <div class="cart-tool">
      <div class="select-all">
        <input 
        class="chooseAll" 
        type="checkbox"
        :checked="isAllCheck&&cartInfoList.length > 0"
        @change="updateAllCartChecked">
        <span>全选</span>
      </div>
      <div class="option">
        <a @click="deleteAllCheckedCart">删除选中的商品</a>
        <a href="#none">移到我的关注</a>
        <a href="#none">清除下柜商品</a>
      </div>
      <div class="money-box">
        <div class="chosed">已选择
          <span>{{ totalSum }}</span>件商品</div>
        <div class="sumprice">
          <em>总价（不含运费） ：</em>
          <i class="summoney">{{ totalPrice }}</i>
        </div>
        <div class="sumbtn">
          <router-link class="sum-btn" to="/trade" >结算</router-link>
        </div>
      </div>
    </div>
  </div>
</template>

<script>
import {mapGetters} from 'vuex';
import throttle from "lodash/throttle"
  export default {
    name: 'ShopCart',
    mounted(){
      //data为什么是空的? 因为你没有告诉服务器你是谁 可以使用node的uuid 随机数+当前时间戳,请求头带参
      this.getData()
    //  console.log(this.cartInfoList);
    //  console.log(this.totalSum);
    },
    methods: {
      //发请求获取购物车列表
      getData(){
        this.$store.dispatch("shopcart/getCartList")
      },
      //改变某产品的购买数量
      handler:throttle(async function(type,disNum,cart){
      //type: 为了区分这三个元素
      //disNum:形参  +1 -1 input输入数量
      //cart:哪一个产品[身上有id]
      //向服务器发请求,修改数量
     
      switch(type){
         //增加
        case "add":
          disNum = 1;
          break;
          // //减少
        case "minus":
          //判断产品的个数大于1,才传递给服务器 -1
          //如果出现产品个数小于等于1,传递给服务器 0 
          disNum = cart.skuNum > 1 ? -1: 0
          break;
        case "change":
         //用户输入进来的最终量,如果非法数字(比如带有汉字|负数),带给服务器 0
          if(isNaN(disNum) || disNum < 1){
            disNum = 1;
          }else{
            //正常情况(小数:取正) 
            disNum = parseInt(disNum) - cart.skuNum;
          }
          break; 
      }
        //派发action
        try {
          await this.$store.dispatch("detail/addOrUpdateShopCart",{
            skuId:cart.skuId,
            skuNum:disNum,
          });
          // 再一次获取服务器最新的数据进行展示
          this.getData();
          }catch(error){
            alert('添加购物车失败了')
          }
      },500),
      //删除某一个产品
    async  deleteCartById(cart){
        //因为删除接口不给返回内容所以需要自己些条件判断是否成功.很多这种类型的接口都最好这种写,方便后期维护
        try {
         //记得如果删除成功再次发请求获取新的数据进行展示
         await this.$store.dispatch("shopcart/deleteCartListBySkuId",cart.skuId);
         this.getData();
        }catch(error){
          alert(error.message)
        }
      },
      //删除选中的产品
     async deleteAllCheckedCart(){
       try {
        //派发一个action
         await this.$store.dispatch("shopcart/deleteAllCheckedCart")
         //再发请求获取购物车列表
         this.getData();
       }catch(error){
          alert(error.message);
       }
      },
        //修改全部产品的选中状态
     async updateAllCartChecked(event) {
      try {
        let isChecked = event.target.checked ? "1" : "0";
        //派发action
        await this.$store.dispatch("shopcart/updateAllCartIsChecked", isChecked);
        this.getData();
      } catch (error) {
        alert(error.message);
      }
       },
       //修改某个产品的勾选状态
     async updateChecked(cart, event) {
      //带给服务器的参数isChecked，不是布尔值，应该是0|1
      try {
        //如果修改数据成功，再次获取服务器数据（购物车）
        let isChecked = event.target.checked ? "1" : "0";
        await this.$store.dispatch("shopcart/updateCheckedById", {
          skuId: cart.skuId,
          isChecked,
        });
        this.getData();
       // console.log(this.cartInfoList);
      } catch (error) {
        //如果失败提示
        alert(error.message);
      }
        },
    },
    computed:{
      ...mapGetters("shopcart",["cartList"]),
      //购物车数据
      cartInfoList(){
        return this.cartList.cartInfoList || [];
      },
      //计算购买数量
      totalSum(){
       let totalsum = 0;
       this.cartInfoList.filter((item) => item.isChecked == 1).forEach((item) => totalsum += item.skuNum)
       
       return totalsum
      },
      //计算购买产品的总价
      totalPrice(){
        let sum = 0;
        this.cartInfoList.forEach((item) => { 
          sum += item.skuNum * item.skuPrice;
         });
         return sum;
      },
      //判断底部复选框是否勾选
      isAllCheck(){
        //使用every方法 每一项都为1,才返回true
        return this.cartInfoList.every(item  => item.isChecked == 1 )
      }
    }
  }
</script>

<style lang="less" scoped>
  .cart {
    width: 1200px;
    margin: 0 auto;

    h4 {
      margin: 9px 0;
      font-size: 14px;
      line-height: 21px;
    }

    .cart-main {
      .cart-th {
        background: #f5f5f5;
        border: 1px solid #ddd;
        padding: 10px;
        overflow: hidden;

        &>div {
          float: left;
        }

        .cart-th1 {
          width: 25%;

          input {
            vertical-align: middle;
          }

          span {
            vertical-align: middle;
          }
        }

        .cart-th2 {
          width: 25%;
        }

        .cart-th3,
        .cart-th4,
        .cart-th5,
        .cart-th6 {
          width: 12.5%;

        }
      }

      .cart-body {
        margin: 15px 0;
        border: 1px solid #ddd;

        .cart-list {
          padding: 10px;
          border-bottom: 1px solid #ddd;
          overflow: hidden;

          &>li {
            float: left;
          }

          .cart-list-con1 {
            width: 15%;
          }

          .cart-list-con2 {
            width: 35%;

            img {
              width: 82px;
              height: 82px;
              float: left;
            }

            .item-msg {
              float: left;
              width: 150px;
              margin: 0 10px;
              line-height: 18px;
            }
          }

         

          .cart-list-con4 {
            width: 10%;

          }

          .cart-list-con5 {
            width: 17%;

            .mins {
              border: 1px solid #ddd;
              border-right: 0;
              float: left;
              color: #666;
              width: 6px;
              text-align: center;
              padding: 8px;
            }

            input {
              border: 1px solid #ddd;
              width: 40px;
              height: 33px;
              float: left;
              text-align: center;
              font-size: 14px;
            }

            .plus {
              border: 1px solid #ddd;
              border-left: 0;
              float: left;
              color: #666;
              width: 6px;
              text-align: center;
              padding: 8px;
            }
          }

          .cart-list-con6 {
            width: 10%;

            .sum {
              font-size: 16px;
            }
          }

          .cart-list-con7 {
            width: 12.5%;

            a {
              color: #666;
            }
          }
        }
      }
    }

    .cart-tool {
      overflow: hidden;
      border: 1px solid #ddd;

      .select-all {
        padding: 10px;
        overflow: hidden;
        float: left;

        span {
          vertical-align: middle;
        }

        input {
          vertical-align: middle;
        }
      }

      .option {
        padding: 10px;
        overflow: hidden;
        float: left;

        a {
          float: left;
          padding: 0 10px;
          color: #666;
        }
      }

      .money-box {
        float: right;

        .chosed {
          line-height: 26px;
          float: left;
          padding: 0 10px;
        }

        .sumprice {
          width: 200px;
          line-height: 22px;
          float: left;
          padding: 0 10px;

          .summoney {
            color: #c81623;
            font-size: 16px;
          }
        }

        .sumbtn {
          float: right;

          a {
            display: block;
            position: relative;
            width: 96px;
            height: 52px;
            line-height: 52px;
            color: #fff;
            text-align: center;
            font-size: 18px;
            font-family: "Microsoft YaHei";
            background: #e1251b;
            overflow: hidden;
          }
        }
      }
    }
  }
</style>